Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century
Abstract Two approaches were used to qualify observed variability in Greenland cod ( Gadus morhua ) recruitment. In the first analysis, we used the linear trend of the Greenland cod recruitment time series and climatic variables, such as air temperatures from the Denmark Strait and wind conditions o...
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crwiley:10.1046/j.1365-2419.2003.00280.x 2024-06-02T08:05:44+00:00 Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century Stein, M. Borovkov, V.A. 2004 http://dx.doi.org/10.1046/j.1365-2419.2003.00280.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2419.2003.00280.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2419.2003.00280.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Oceanography volume 13, issue 2, page 111-120 ISSN 1054-6006 1365-2419 journal-article 2004 crwiley https://doi.org/10.1046/j.1365-2419.2003.00280.x 2024-05-03T10:40:41Z Abstract Two approaches were used to qualify observed variability in Greenland cod ( Gadus morhua ) recruitment. In the first analysis, we used the linear trend of the Greenland cod recruitment time series and climatic variables, such as air temperatures from the Denmark Strait and wind conditions off East Greenland and Southwest Greenland, to explain the interannual variation in cod recruitment off Greenland. The model resulting from this ‘trend/environmental approach’, explained 79% of the interannual variation in cod recruitment off Greenland. In the second, analytical approach, the ‘regime approach’, multiple linear regression models were used, with the input data being the time series of cod recruitment and spawning stock biomass (SSB) from Iceland and Greenland, sea surface and air temperatures around Greenland, and zonal wind components between Iceland and Greenland. Model results indicated that, during the decades between 1950 and 1990, there were three different cause–effect regimes which significantly influenced the variability of cod recruitment. The three regimes included: (a) the 1950s and 1960s, a regime with favorable sea surface temperatures and a self‐sustaining cod stock off Greenland with high SSB that produced a series of above‐average, strong year classes; (b) the 1970s and 1980s, a regime of declining SSB and recruitment, with recruitment dependent on advection from Iceland; and (c) the 1990s, when the advective potential for recruitment from the Icelandic cod stock was the only available source for replenishment of the Greenland cod stocks, because cod recruitment in Greenland waters was negligible. The three models explained 76–77% of the observed interannual variation in cod recruitment off Greenland. Both approaches suggested that advective factors were the dominant influences for cod recruitment in the ‘Iceland–Greenland System’. Article in Journal/Newspaper Denmark Strait East Greenland Gadus morhua Greenland Greenland cod Greenland Sea Iceland Wiley Online Library Greenland Fisheries Oceanography 13 2 111 120 |
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English |
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Abstract Two approaches were used to qualify observed variability in Greenland cod ( Gadus morhua ) recruitment. In the first analysis, we used the linear trend of the Greenland cod recruitment time series and climatic variables, such as air temperatures from the Denmark Strait and wind conditions off East Greenland and Southwest Greenland, to explain the interannual variation in cod recruitment off Greenland. The model resulting from this ‘trend/environmental approach’, explained 79% of the interannual variation in cod recruitment off Greenland. In the second, analytical approach, the ‘regime approach’, multiple linear regression models were used, with the input data being the time series of cod recruitment and spawning stock biomass (SSB) from Iceland and Greenland, sea surface and air temperatures around Greenland, and zonal wind components between Iceland and Greenland. Model results indicated that, during the decades between 1950 and 1990, there were three different cause–effect regimes which significantly influenced the variability of cod recruitment. The three regimes included: (a) the 1950s and 1960s, a regime with favorable sea surface temperatures and a self‐sustaining cod stock off Greenland with high SSB that produced a series of above‐average, strong year classes; (b) the 1970s and 1980s, a regime of declining SSB and recruitment, with recruitment dependent on advection from Iceland; and (c) the 1990s, when the advective potential for recruitment from the Icelandic cod stock was the only available source for replenishment of the Greenland cod stocks, because cod recruitment in Greenland waters was negligible. The three models explained 76–77% of the observed interannual variation in cod recruitment off Greenland. Both approaches suggested that advective factors were the dominant influences for cod recruitment in the ‘Iceland–Greenland System’. |
format |
Article in Journal/Newspaper |
author |
Stein, M. Borovkov, V.A. |
spellingShingle |
Stein, M. Borovkov, V.A. Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
author_facet |
Stein, M. Borovkov, V.A. |
author_sort |
Stein, M. |
title |
Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
title_short |
Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
title_full |
Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
title_fullStr |
Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
title_full_unstemmed |
Greenland cod ( Gadus morhua): modeling recruitment variation during the second half of the 20th century |
title_sort |
greenland cod ( gadus morhua): modeling recruitment variation during the second half of the 20th century |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1046/j.1365-2419.2003.00280.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2419.2003.00280.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2419.2003.00280.x |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait East Greenland Gadus morhua Greenland Greenland cod Greenland Sea Iceland |
genre_facet |
Denmark Strait East Greenland Gadus morhua Greenland Greenland cod Greenland Sea Iceland |
op_source |
Fisheries Oceanography volume 13, issue 2, page 111-120 ISSN 1054-6006 1365-2419 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2419.2003.00280.x |
container_title |
Fisheries Oceanography |
container_volume |
13 |
container_issue |
2 |
container_start_page |
111 |
op_container_end_page |
120 |
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1800750613916549120 |